Propeller mounting



April 7, 1931. R. RMUHLr-:NBRUCK PROPELLER MOUNTING Filed Nov. 8, 1929 INVENTOR i Il=== ATTORNEY Patented Apr. 1931 UNITED i sTATEs my r. uunrnmsnncx, or marron, Iowa rnornLLna MOUNTING Application le'd November 8, 1929. Serial No. 405,717.

The present invention contemplates the provision of a double propeller construction oraeroplanes and the like, which materially increases the efficiency of t e motor, the invention being constructed to permit its association with the regular propeller shaft of the machine, or its removal therefrom as the occasion may require. i

The nature and advantages of the invention n, will be better understood when the following detail description is read in connection with the accompanying drawing, the invention residing in the construction, combination and arrangement of parts as claimed.

In the drawing forming part of this a plication like numerals of reference indicate similar parts in the several views, and wherein ,Y l

Figure l is a sectional view. throu h the 2o invention showing it associated wit the usual propeller shaft of a machine.

Figure 2 is a sectional view taken on line 2-2 of Figure 1.4

Referring to the drawing in detail,

indicates the base of the motor and wherein 11 is the usual propeller shaft.

The constructlon forming the subject matter of the present invention, embodies a sleeve 12 adapted to receive the adjacent ends of the propeller shaft 11, to which it is secured by suitable fastening elements 13, the latter bein .also utilized to secure the hub 14 of a beve ed gear 15 attached to the sleeve 12 as clearly illustrated in Figure 1. Projecting forwardly from the sleeve 12 and in a line Ywith the propeller shaft 11, is a shaft 16 upon which 1s mounted the hub 17 of a beveled ear 18, and attached to this gear is one of t e propellers indicated at 19. The hub 20 of this propeller is arranged between the gear 18 and a disk 21 mounted on the shaft 16, and passed through these parts are suitable bolts for holding the pro eller attached to the gear as will be read' y nnderstood. Surrounding the propeller shaft 11 inspaced concentric relation thereto, is a ring like member 22 in the nature of'a bracket, which includes arms 23 utilized to secure the bracket to the machine 10 through the in- 60 strumentality of suitable fastening elements 24. Carried by the ring like member 22 are bearing sockets 24 arranged at diametrically opposite oints, each socket having journaled therein t e shaft 25 of a beveled gear 26, these latter mentioned gears meshing withv the gears 15 and 18 respectively, above referred to. The inner ends of the shaft 25 are also journaled in a bearing -ring 27 which is supported upon the sleeve 12.

It will be noted that the outer end of the shaft 16 is slightly tapered as at 28, and

-mounted upon th1s tapered extremity is the hub of the other vpropeller indicated at 29, the propeller being attached to the shaft in any suitable manner. Arranged between the respective propellers is a spacing sleeve or collar 30, one end of which bears against the disk 21 while the opposite end is flanged as at 31 and bears against the hub of the propeller 29. By use of a plurality of ropellers arranged one in advance of the ot er,

the efficiency of the motor is materiell increased, the forward propeller rotating 1n an anti-clockwise direction, while the rear propeller operates in a clockwise direction.

The construction has been devised to permit of its use in conjunction with aeroplanes or the like in place of the ordinary propeller, and the invention can be easily and quickly attached to the usual propeller shaft in the manner illustrated in the drawing, after the ordinary propeller is removed 'from the shaft 11.

While it is believed that from the foregoing description the nature and advanta es of the invention will be readily understoo I desire to have it known that l do not limit m self to what is herein lillustrated' and described, and that such changes may be restored to when desired as fall within the scope of what is claimed.

What I claim is:

In combination with a motor and propeller shaft therefor, of an attachment therefor comprising .a sleeve'receivin said shaft, a shaft projecting forwardly rom the sleeve in a line with the propeller shaft, a gear carried by said sleeve, a second gear carried by the shaft of said sleeve, a propeller carried by the second mentioned gear, an additional pro- 100 peller carried by the shaft'of the sleeve and arran ed in advance of the first mention prope ler, a ring like member surrounding the sleeve in spaced concentric relation there- 5 to, and arranged immediately adjacent the motor brackets carried by the ring like member for securing the sameto the motor base, and a plurality of pinion gears ournaled in said ring like member and meshing with the 10 aferementioned gears for the purpose speci-v e A In testimony whereof 1 aftx msignature.. ROY F. MHLEN BUCK." 

